What is known
S48A Unicorn hostage, Harunobu's cousin, and at Setsuna's wedding. Blunt by nature and aware of it. Wants the war over so she can go home. Surrendered to Akihito trusting he would do right by her, and there is evidently something between them she did not deny. Convinced Kazumi cheated in the duel — she fought him once herself and knows he never healed from it. Once had a match to Kazumi floated at her and beat him bloody in the rain instead.
S49The Unicorn did not know she was alive. Held by Akihito and never ransomed, which they took badly.
S50Still held. The request to free her for the delegation was refused, courteously, and her disposition folded into the negotiation itself.